I found a funky cast aluminum mess kit in my wife's grandpa's garage that looks like this:
It sits perfectly on the intake manifold on my F155 motor, nestled between the valve cover and the carb. No attachment hardware required. It's been there for several years and heats up food nicely. I would be hard pressed to squeeze more than one Qdoba burrito in there, though.
Turns out it is a WWI vintage Army mess, so it seems appropriate for use in the 40.
You might be able to just bundle the burritos in tinfoil and sit them in the same spot on your 2F. Worth checking out.